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  ThermoFluidCalc — Standalone Fortran Execution Guide
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Calculator : Thermal Entry Length Calculator
Category   : Convection

Files Included:
  - entry_length.f90 (Fortran 90/2008 Source Code)
  - input.txt (Pre-configured Sample Input)

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1. How to Compile
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Make sure you have GNU Fortran (gfortran) or Intel Fortran (ifort) installed.
Run the following compilation command in your terminal:

  gfortran -O3 entry_length.f90 -o entry_length

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2. How to Execute
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Run the compiled binary and pipe the input.txt file into stdin:

  entry_length < input.txt

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3. Input Parameter Sequence
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Pipe diameter D [m]
Mean flow velocity V [m/s]
Inlet fluid temperature Tin [C]
Wall temperature Tw [C]
Pipe length L [m]
Fluid type (1=Air, 2=Water, 3=Oil)
Custom density [kg/m3] (0=auto)
Custom viscosity [Pa-s] (0=auto)
Custom thermal conductivity [W/m-K] (0=auto)
Custom Prandtl number (0=auto)
Custom specific heat [J/kg-K] (0=auto)
Boundary condition type (1=Uniform Wall Temp, 2=Uniform Heat Flux)

Website : https://thermofluidcalc.com
